<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            float: left;
            margin: 20px;
            background-color: red;
        }

        div div {
            width: 150px;
            height: 150px;
            float: left;
            margin: 10px;
            background-color: green;
        }
    </style>
</head>

<body>
    <div>11
        <div>2</div>
    </div>
    <div>1</div>

</body>

</html>